What does Kong Ming mean by borrowing an arrow?

From the forty-sixth chapter of Romance of the Three Kingdoms, "Huang Gai borrowed an arrow from his plot and was punished". Zhou Yu was jealous of Zhuge Liang's talent and asked Zhuge Liang to build 100 thousand arrows in ten days, hoping to frame him. Zhuge Liang used clever means to "borrow an arrow" from Cao Cao, which foiled Zhou Yu's plot against him and showed Zhuge Liang's courage and wisdom.